我有一个多线程(boost：：thread 1.67.0(测试应用程序，它在VC++(MSVS2017 v15.7(下编译良好，但在GCC下无法编译。抛出的错误对我来说真的很难理解。 我认为这与我创建线程的方式有关。 有没有办法获得更好的调试信息？

法典

#include <iostream>
#include <chrono>
using namespace std::chrono;
template<typename T>
auto toMs(T &&time) {
return duration_cast<milliseconds>(time).count();
}
#include <string>
#include <regex>
void cxxregex(std::string const&inputString, std::string const&searchRegex)
{
auto startTime = steady_clock::now();
std::regex regexObj(searchRegex.data(), std::regex::extended);
std::smatch matchObj;
regex_search(inputString.begin(), inputString.end(), matchObj, regexObj);
std::cout << toMs(steady_clock::now() - startTime) << "ms " << matchObj[1] << std::endl;
}
#include <boost/regex.hpp>
void boostregex(std::string const&inputString, std::string const&searchRegex)
{
auto startTime = steady_clock::now();
boost::regex regexObj(searchRegex.data(), boost::regex::extended);
boost::smatch matchObj;
regex_search(inputString.begin(), inputString.end(), matchObj, regexObj);
std::cout << toMs(steady_clock::now() - startTime) << "ms " << matchObj[1] << std::endl;
}
#include <future>
void threadFcn(
const int threadId,
const std::string::const_iterator& subStringBegin,
const std::string::const_iterator& subStringEnd,
const boost::regex& regexObj,
std::promise<std::pair<size_t, std::string>>& matchProm,
const std::shared_future<std::pair<size_t, std::string>>& matchFut)
{
boost::smatch matchObj;
if (regex_search(subStringBegin, subStringEnd, matchObj, regexObj))
{
// match is found!
if (matchFut.wait_for(0s) != std::future_status::ready) // check of not already set
matchProm.set_value(std::make_pair(threadId, matchObj[1]));// matchObj.str()));
}
}
#include <thread>
#include <vector>
#include <algorithm>
using namespace std::chrono_literals;
void boostparregex(std::string const &inputString, std::string const &searchRegex)
{
auto nrOfCpus = std::thread::hardware_concurrency() / 2;
std::cout << "(Nr of CPUs: " << nrOfCpus << ") ";
if (searchRegex.find("^") != std::string::npos || searchRegex.find("$") != std::string::npos) {
std::cout << "Start-of-line not supported multi-CPU. Defaulting to 1.n";
nrOfCpus = 1;
}
auto startTime = steady_clock::now();
boost::regex regexObj(searchRegex.data(), boost::regex::extended);
std::promise<std::pair<size_t, std::string>> foundThreadIdProm;
auto foundThreadIdFut = foundThreadIdProm.get_future().share();
std::vector<std::thread> threadVector; threadVector.reserve(nrOfCpus);
auto stringSizePerThread = inputString.length() / nrOfCpus;
for (size_t threadId = 0; threadId < nrOfCpus; threadId++) {
// determine string start and end
const auto begin = inputString.begin() + (threadId * stringSizePerThread);
const auto end = inputString.end(); // all cpu's search to end of input string. they only differ in start
// create thread
threadVector.push_back(std::thread(threadFcn,
(int)threadId, std::ref(begin), std::ref(end), std::ref(regexObj), std::ref(foundThreadIdProm), std::ref(foundThreadIdFut)));
}
if (foundThreadIdFut.wait_for(10s) == std::future_status::ready) std::cout
<< toMs(steady_clock::now() - startTime) << "ms. "
<< "Thread " << foundThreadIdFut.get().first << ": " << foundThreadIdFut.get().second << std::endl;
else std::cerr << "Error: string not found!!" << std::endl;
for (auto& thread : threadVector) thread.join(); // I'd rather detach... but then the references are destroyed, giving problems.
}
int main()
{
std::string s(1000000000, 'x');
{
std::string s1 = "yolo" + s;
std::cout << "yolo + ... -> cxxregex "; cxxregex(s1, "(yolo)");
std::cout << "yolo + ... -> boostregex "; boostregex(s1, "(yolo)");
std::cout << "yolo + ... -> boostparregex "; boostparregex(s1, "(yolo)");
}
{
std::string s2 = s + "yolo";
std::cout << "... + yolo -> cxxregex "; cxxregex(s2, "(yolo)");
std::cout << "... + yolo -> boostregex "; boostregex(s2, "(yolo)");
std::cout << "... + yolo -> boostparregex "; boostparregex(s2, "(yolo)");
}
{
std::string s3 = "yo" + s + "lo";
//std::cout << "... + yolo -> cxxregex "; cxxregex(s3, "(yo).*(lo)"); // doesn't even work
std::cout << "... + yolo -> boostregex "; boostregex(s3, "(yo).*(lo)");
std::cout << "... + yolo -> boostparregex "; boostparregex(s3, "(yo).*(lo)");
}
std::cin.ignore();
}

海湾合作委员会错误输出

g++ main.cpp -Wall -Wextra -I../Boost/boost_1_67_0 -std=c++14

给：

/tmp/cc9cP6LZ.o: In function `std::thread::thread<void (&)(int, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, std::promise<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&, std::shared_future<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&), int, std::reference_wrapper<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const>, std::reference_wrapper<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const>, std::reference_wrapper<boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > >, std::reference_wrapper<std::promise<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, std::reference_wrapper<std::shared_future<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >(void (&)(int, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, std::promise<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >&, std::shared_future<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > const&), int&&, std::reference_wrapper<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const>&&, std::reference_wrapper<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > const>&&, std::reference_wrapper<boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > >&&, std::reference_wrapper<std::promise<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&&, std::reference_wrapper<std::shared_future<std::pair<unsigned long, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&&)':
main.cpp:(.text._ZNSt6threadC2IRFviRKN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESD_RKN5boost11basic_regexIcNSE_12regex_traitsIcNSE_16cpp_regex_traitsIcEEEEEERSt7promiseISt4pairImSA_EERKSt13shared_futureISP_EEJiSt17reference_wrapperISC_ESZ_SY_ISK_ESY_ISQ_ESY_IST_EEEEOT_DpOT0_[_ZNSt6threadC5IRFviRKN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESD_RKN5boost11basic_regexIcNSE_12regex_traitsIcNSE_16cpp_regex_traitsIcEEEEEERSt7promiseISt4pairImSA_EERKSt13shared_futureISP_EEJiSt17reference_wrapperISC_ESZ_SY_ISK_ESY_ISQ_ESY_IST_EEEEOT_DpOT0_]+0x156): undefined reference to `pthread_create'
/tmp/cc9cP6LZ.o: In function `bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >)':
main.cpp:(.text._ZN5boost12regex_searchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsESJ_[_ZN5boost12regex_searchIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISB_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SJ_RNS_13match_resultsISJ_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsESJ_]+0xba): undefined reference to `boost::re_detail_106700::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::find()'
/tmp/cc9cP6LZ.o: In function `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)':
main.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[_ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j]+0x2a): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)'
/tmp/cc9cP6LZ.o: In function `boost::re_detail_106700::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >)':
main.cpp:(.text._ZN5boost16re_detail_10670012perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC2ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_[_ZN5boost16re_detail_10670012perl_matcherIN9__gnu_cxx17__normal_iteratorIPKcNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEEESaINS_9sub_matchISC_EEENS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEC5ESC_SC_RNS_13match_resultsISC_SF_EERKNS_11basic_regexIcSJ_EENS_15regex_constants12_match_flagsESC_]+0x124): undefined reference to `boost::re_detail_106700::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::construct_init(boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags)'
collect2: error: ld returned 1 exit status